Print Preview: Make print preview tab modal.

chrome/renderer/print_web_view_helper.h

Index: chrome/renderer/print_web_view_helper.h
===================================================================
--- chrome/renderer/print_web_view_helper.h	(revision 105366)
+++ chrome/renderer/print_web_view_helper.h	(working copy)
@@ -21,6 +21,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "ui/gfx/size.h"
 
+class MessageLoop;
 struct PrintMsg_Print_Params;
 struct PrintMsg_PrintPage_Params;
 struct PrintMsg_PrintPages_Params;
@@ -297,6 +298,9 @@
   // Returns true if print preview should continue, false on failure.
   bool PreviewPageRendered(int page_number, printing::Metafile* metafile);
 
+  // Stop the nested message loop when print preview has finished.
+  void OnPrintPreviewDone();
+
   WebKit::WebView* print_web_view_;
 
   scoped_ptr<PrintMsg_PrintPages_Params> print_pages_params_;
@@ -374,10 +378,12 @@
     // Setters
     void set_generate_draft_pages(bool generate_draft_pages);
     void set_error(enum PrintPreviewErrorBuckets error);
+    void set_message_loop(MessageLoop* message_loop);
 
     // Getters
     WebKit::WebFrame* frame() const;
     const WebKit::WebNode& node() const;
+    MessageLoop* message_loop() const;
     int total_page_count() const;
     bool generate_draft_pages();
     printing::PreviewMetafile* metafile() const;
@@ -404,6 +410,8 @@
     scoped_ptr<printing::PreviewMetafile> metafile_;
     scoped_ptr<PrintMsg_Print_Params> print_params_;
 
+    MessageLoop* message_loop_;
+
     // Total page count in the renderer.
     int total_page_count_;